2 files changed, 101 insertions, 0 deletions
diff --git a/app/controllers/api/keys_controller.rb b/app/controllers/api/keys_controller.rb
new file mode 100644
index 0000000..d4cb759
--- /dev/null
+++ b/app/controllers/api/keys_controller.rb
@@ -0,0 +1,63 @@
+class Api::KeysController < ApiController
+
+  before_filter :require_login
+  before_filter :require_enabled
+
+  # get /keys
+  def index
+    keys = identity.keys.map do |k,v|
+      [k, JSON.parse(v)]
+    end
+    render json: keys.to_h
+  end
+
+  def show
+    render json: JSON.parse(identity.keys[params[:id]])
+  end
+
+  def create
+    keyring.create type, value
+    head :no_content
+  rescue Keyring::Error, ActionController::ParameterMissing => e
+    render status: 422, json: {error: e.message}
+  end
+
+  def update
+    keyring.update type, rev: rev, value: value
+    head :no_content
+  rescue Keyring::Error, ActionController::ParameterMissing => e
+    render status: 422, json: {error: e.message}
+  end
+
+  protected
+
+  def require_enabled
+    if !current_user.enabled?
+      access_denied
+    end
+  end
+
+  def service_level
+    current_user.effective_service_level
+  end
+
+  def type
+    params.require :type
+  end
+
+  def value
+    params.require :value
+  end
+
+  def rev
+    params.require :rev
+  end
+
+  def keyring
+    @keyring ||= Keyring.new identity
+  end
+
+  def identity
+    @identity ||= Identity.for(current_user)
+  end
+end
diff --git a/app/models/keyring.rb b/app/models/keyring.rb
new file mode 100644
index 0000000..6779d5d
--- /dev/null
+++ b/app/models/keyring.rb
@@ -0,0 +1,38 @@
+#
+# Keyring
+#
+# A collection of cryptographic keys.
+#
+
+class Keyring
+  class Error < RuntimeError
+  end
+
+  def initialize(storage)
+    @storage = storage
+  end
+
+  def create(type, value)
+    raise Error, "key already exists" if storage.keys[type].present?
+    storage.set_key type, {type: type, value: value, rev: new_rev}.to_json
+    storage.save
+  end
+
+  def update(type, rev:, value:)
+    old_rev = key_of_type(type)['rev']
+    raise Error, "wrong revision: #{rev}" unless old_rev == rev
+    storage.set_key type, {type: type, value: value, rev: new_rev}.to_json
+    storage.save
+  end
+
+  def key_of_type(type)
+    JSON.parse(storage.keys[type])
+  end
+
+  protected
+  attr_reader :storage
+
+  def new_rev
+    SecureRandom.urlsafe_base64(8)
+  end
+end